A non-return injection nozzle and hot runner system

Abstract

The utility model discloses a non-return injection nozzle and hot runner system, comprising an injection nozzle body, an injection nozzle head and a non-return core, wherein an injection channel is arranged inside the injection nozzle body, and a step groove hole is arranged on the top of the injection channel, an injection nozzle head is arranged on the top of the injection nozzle body, a feed hole is arranged inside the injection nozzle head, the feed hole is matched with the step groove hole, the inside of the step groove hole is slidably arranged on the non-return core, and a first channel is arranged on the outer surface of the non-return core; during injection molding, the non-return core opens the feed hole under the pressure of plastic, and the plastic enters the injection molding channel through the first channel; after the injection molding is stopped, the non-return core closes the feed hole under the backflow pressure of the plastic in the injection molding channel to achieve a non-return effect; by slidingly arranging the non-return core inside the step groove hole, the pressure provided by the plastic can be matched to achieve the function of closing the feed hole, thereby preventing the plastic from flowing back.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding equipment, in particular to a non-return injection nozzle and a hot runner system. Background Art

[0002] At present, the injection mold commonly used in the injection molding industry is the hot runner injection mold. Compared with ordinary molds, the plastic products injected through the hot runner system are of higher quality, and the hot runner system has the advantages of saving raw materials, improving production efficiency, and a high degree of automation.

[0003] As attached Figure 1 As shown, hot runner injection molding includes an injection nozzle 8 and a nozzle head 9. The injection nozzle 8 and the nozzle head 9 are provided with a hot runner and are connected. In the prior art, the injection molding machine nozzle is matched with the nozzle head 9, and plastic is injected into the nozzle head 9 and the hot runner of the injection nozzle 8; however, the hot runner of the existing nozzle head 9 and the injection nozzle 8 is bidirectional. When the injection molding machine nozzle is removed, the molten plastic will flow out from the opening of the nozzle head 9 after extrusion, and the outflowing plastic will solidify at the opening to block the opening, affecting the injection molding work of the injection molding machine nozzle again.

[0004] In view of this, the existing technology needs to be improved and developed. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a non-return injection nozzle and hot runner system, aiming to solve the problem that the hot runner of the existing injection nozzle flows in both directions, the plastic will overflow into the opening and solidify to block the opening, affecting the injection molding work of the injection molding machine nozzle.

[0006] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0007] A backflow prevention injection nozzle, comprising:

[0008] The injection nozzle body has an injection channel provided inside, and a stepped slot is provided on the top of the injection channel;

[0009] An injection nozzle head is arranged on the top of the injection nozzle body; a feed hole is arranged inside the injection nozzle head, and the feed hole cooperates with the step groove hole;

[0010] A check core is slidably arranged in the step groove to close or open the feed hole; a first channel is provided on the outer surface of the check core to connect the feed hole with the injection channel.

[0011] Furthermore, a first step groove is provided at the bottom of the anti-return core, and the first step groove cooperates with the bottom wall of the step groove hole to limit the sliding of the anti-return core.

[0012] Furthermore, the top of the feed hole is a straight hole, the bottom of the feed hole is a conical hole, the top of the check core is conical, and the top of the check core cooperates with the bottom of the feed hole so that the check core closes the feed hole.

[0013] Furthermore, the top wall of the anti-return core is an arcuate surface, and a fitting surface is provided on the conical surface at the top of the anti-return core. The fitting surface is connected to the arcuate surface, and the fitting surface cooperates with the side wall of the conical hole at the bottom of the feed hole.

[0014] Furthermore, the cross-sectional diameter of the connection between the fitting surface and the arc-shaped surface is larger than the diameter of the straight hole.

[0015] Furthermore, the first channel is vertically arranged on the outer surface of the anti-return core, and the first channel is arc-shaped.

[0016] Furthermore, three first channels are radially arranged on the outer surface of the anti-return core.

[0017] A hot runner system, comprising the two non-return injection nozzles as described above, further comprising:

[0018] A diverter plate is provided at the bottom of the two injection nozzle bodies; a first channel and a second channel are provided inside the diverter plate, and the first channel and the second channel are respectively connected to the injection channels of the two injection nozzle bodies;

[0019] A hot nozzle is disposed at the bottom of the manifold; a first hot runner and a second hot runner are disposed inside the hot nozzle, the first hot runner is connected to the first channel, the second hot runner is connected to the second channel, the second hot runner is disposed around the first channel, and the bottom of the second hot runner is arranged at an angle toward the first hot runner;

[0020] A nozzle is provided at the bottom of the hot nozzle; the bottoms of the first hot runner and the second hot runner are both connected to the nozzle;

[0021] A valve needle is slidably disposed in the first channel and the first hot runner to close the nozzle.

[0022] Furthermore, an electric telescopic cylinder is provided on the top of the diverter plate, and the protruding end of the electric telescopic cylinder is connected to the valve needle.

[0023] Furthermore, a heater is provided on the outside of the hot nozzle, and a heat insulation cap is provided at the nozzle of the hot nozzle.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] In the present invention, an injection channel is provided inside the injection nozzle body, and a step groove is provided on the top of the injection channel, an injection nozzle head is provided on the top of the injection nozzle body, and a feed hole is provided inside the injection nozzle head, the feed hole cooperates with the step groove, and the inside of the step groove is slidably provided on a non-return core, and the outer surface of the non-return core is provided with a first channel; when injection molding, the non-return core opens the feed hole under the pressure of the plastic, and the plastic enters the injection channel through the first channel; when injection molding is stopped, the non-return core closes the feed hole under the backflow pressure of the plastic in the injection channel to achieve a non-return effect; by sliding the non-return core inside the step groove, the pressure provided by the plastic can be cooperated to achieve the function of closing the feed hole, thereby preventing the plastic from flowing back. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the injection nozzle structure in the prior art.

[0027] Figure 2 This is a schematic structural diagram of the injection nozzle body and the injection nozzle head of the utility model.

[0028] Figure 3 This is a schematic diagram of the structure of the anti-return core and the feed hole of the utility model.

[0029] Figure 4 This is a schematic diagram of the anti-return core structure of the utility model.

[0030] Figure 5 This is a schematic diagram of the first step groove structure of the utility model.

[0031] Figure 6 This is a schematic diagram of the hot runner system structure of the utility model.

[0032] Figure 7 for Figure 6 Enlarged structural diagram at point A in the middle.

[0033] The numbers in the figure are as follows: 1. Injection nozzle body; 11. Injection channel; 12. Step groove hole; 2. Injection nozzle head; 21. Feed hole; 3. Check core; 31. First channel; 32. First step groove; 33. Fitting surface; 4. Injection molding machine nozzle; 5. Diverter plate; 51. First channel; 52. Second channel; 6. Hot nozzle; 61. First hot runner; 62. Second hot runner; 63. Nozzle; 64. Heater; 65. Insulation cap; 7. Valve needle; 71. Electric telescopic cylinder; 8. Injection nozzle; 9. Nozzle head. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and effect of the present invention more clear and explicit, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] As attached Figure 1 As shown, the hot runner of the existing injection nozzle 8 is bidirectional, and there is no structure inside the injection nozzle 8 to prevent backflow. When the injection molding machine nozzle 4 is removed, the molten plastic after extrusion will flow out from the injection nozzle 8 and the opening of the nozzle head 9. The outflowing plastic will solidify at the opening to block the opening, affecting the injection molding machine nozzle 4 to inject again.

[0038] In view of the shortcomings of the existing technology, this embodiment provides a non-return injection nozzle and hot runner system, which can be specifically described as follows:

[0039] As attached Figure 2 , Attachment Figure 3 and attached Figure 4As shown, a non-return injection nozzle includes an injection nozzle body 1, an injection nozzle head 2 and a non-return core 3. The injection nozzle body 1 is provided with an injection channel 11 for plastic flow, and the top of the injection channel 11 is provided with a step slot 12. The step slot 12 is coaxially arranged with the injection channel 11, and the diameter of the step slot 12 is larger than the injection channel 11. The top of the injection nozzle body 1 is provided with an injection nozzle head 2, and the inside of the injection nozzle head 2 is provided with a feed hole 21. The top of the injection nozzle head 2 cooperates with the external injection molding machine gun nozzle 4. The injection molding machine gun nozzle 4 cooperates with the injection nozzle head 2 to inject plastic into the feed hole 21. The bottom of the feed hole 21 Cooperating with the step groove 12 to facilitate the flow of plastic into the injection channel 11, a non-return core 3 is provided for sliding inside the step groove 12. The non-return core 3 can only slide in the step groove 12 due to being restricted by the injection nozzle 2 and the bottom wall of the step groove 12. The non-return core 3 is used to close or open the feed hole 21 to prevent the plastic from flowing back after the injection is completed. The side wall of the non-return core 3 contacts and slides with the side wall of the step groove 12. The outer surface of the non-return core 3 is provided with a first channel 51 to connect the feed hole 21 with the injection channel 11, and allow the plastic entering the feed hole 21 to enter the injection channel 11 through the first channel 51.

[0040] Specifically, the injection nozzle head 2 is connected with the external injection molding machine nozzle 4, and plastic is injected into the feed hole 21 of the injection nozzle head 2 through the injection molding machine nozzle 4. The plastic supports the top of the anti-return core 3 and applies a certain pressure to the anti-return core 3, so that the anti-return core 3 slides to the side close to the injection channel 11. At this time, the feed hole 21 is in a fully open state, and part of the hole of the injection channel 11 is blocked by the bottom wall of the anti-return core 3. However, the injection channel 11 can be connected with the step groove hole 12 and the feed hole 21 through the first channel 51. The plastic entering through the feed hole 21 also enters the injection channel 11 through the first through hole to complete the injection molding work;

[0041] When the injection molding work is completed, the injection molding machine nozzle 4 will be separated from the injection nozzle head 2, and the inside of the injection channel 11 will flow back to the outside of the feed hole 21 due to the high pressure; when the injection molding machine nozzle 4 is separated, the plastic inside the injection channel 11 will generate reverse pressure and flow to the outside of the feed hole 21. At this time, the plastic in the injection channel 11 will first support the bottom of the anti-return core 3. Since the top pressure of the anti-return core 3 is much smaller than the pressure of the plastic in the injection channel 11, the anti-return core 3 will slide upward under the action of the plastic until the top wall of the anti-return core 3 cooperates with the feed hole 21 to close the feed hole 21 to prevent backflow.

[0042] Furthermore, a first channel 51 is provided on the outer surface of the anti-return core 3. During the plastic reflux process, the pressure of the plastic reflux is relatively large, and the bottom of the anti-return core 3 will be supported first. At the same time, the plastic itself has a certain viscosity, and the plastic will not easily flow out through the first channel 51. Under the action of the entire plastic, the force will still mainly act on the anti-return core 3 body, and push the anti-return core 3 to slide toward the feed hole 21, and close the feed hole 21.

[0043] As attached Figure 5 As shown, a first step groove 32 is provided at the bottom of the stop core 3, and the first step groove 32 cooperates with the bottom wall of the step groove hole 12 to limit the sliding of the stop core 3; a first step groove 32 is coaxially opened at the bottom of the stop core 3, and the bottom diameter of the stop core 3 is smaller than the diameter of the top of the stop core 3, and the diameter of the position where the first step groove 32 is opened on the stop core 3 is the same as the diameter of the injection channel 11, and can be slidably arranged in the injection channel 11, and the first channel 51 extends from the top of the stop core 3 to the bottom of the stop core 3, that is, the stop core 3 located in the injection channel 11 is also provided with the first channel 51 to facilitate the step groove hole 12 to be connected with the injection channel 11; the first step groove 32 cooperates with the bottom wall of the step groove hole 12 to prevent the stop core 3 from sliding into the inside of the injection channel 11 without restriction. After the injection molding is stopped, the stop core 3 cannot effectively and quickly close the feed hole 21.

[0044] In one embodiment of this application, Figure 3 As shown, the top of the feed hole 21 is a straight hole, the bottom of the feed hole 21 is a tapered hole, the top of the check core 3 is tapered, and the top of the check core 3 matches the bottom of the feed hole 21 to facilitate the check core 3 to separate the feed holes 21.

[0045] In this embodiment, the top wall of the anti-return core 3 is an arc-shaped surface to facilitate the flow of plastic during injection. A fitting surface 33 is provided on the conical surface on the top of the anti-return core 3. The fitting surface 33 is arranged in a circle and is connected to the arc-shaped surface. The fitting surface 33 cooperates with the side wall of the conical hole at the bottom of the feed hole 21 to completely close the feed hole 21 and prevent the plastic from flowing out of the feed hole 21.

[0046] In this embodiment, the cross-sectional diameter of the connection between the fitting surface 33 and the arc surface is larger than the diameter of the straight hole, so that when the fitting surface 33 fits with the side wall of the tapered hole, it can effectively block the straight hole and avoid backflow.

[0047] In this application, an embodiment is shown in the attached Figure 4 As shown, the first channel 51 is vertically arranged on the outer surface of the anti-return core 3, and the first channel 51 is in an arc shape. The entire first channel 51 is in an arc shape, which can increase the fluidity of the plastic material.

[0048] In this embodiment, three first channels 51 are radially arranged on the outer surface of the anti-return core 3 . The three first channels 51 are evenly distributed on the outer surface of the anti-return core 3 to increase the flow speed of the plastic.

[0049] As attached Figure 6 and attached Figure 7 As shown, the present application also provides a hot runner system, including the two aforementioned non-return injection nozzles, and also including a diverter plate 5, a hot nozzle 6, a nozzle 63 and a valve needle 7. The two injection nozzle bodies 1 are arranged in the template, and the tops of the two injection nozzle bodies 1 are used to cooperate with the external injection molding machine nozzle 4. The diverter plate 5 is arranged at the bottom of the two injection nozzle bodies 1, that is, at the bottom of the template and connected to the bottom wall of the template. The interior of the diverter plate 5 is provided with a first channel 51 and a second channel 52, and the first channel 51 and the second channel 52 are respectively connected to the injection channels 11 of the two injection nozzle bodies 1 to facilitate the injection molding of two different plastics. The bottom of the diverter plate 5 is provided with a hot nozzle 6, and the interior of the hot nozzle 6 is provided with a hot nozzle 6. There are a first hot runner 61 and a second hot runner 62. The first hot runner 61 is connected to the first channel 51, and the second hot runner 62 is connected to the second channel 52. The second hot runner 62 is arranged around the first channel 51, and the bottom of the second hot runner 62 is inclined toward the direction of the first hot runner 61. A nozzle 63 is provided at the bottom of the hot nozzle 6. The bottoms of the first hot runner 61 and the second hot runner 62 are both connected to the nozzle 63. The nozzle 63 is coaxially arranged with the first hot runner 61. The bottom of the second hot runner 62 is conically arranged. The bottom of the second hot runner 62 is connected to the nozzle 63. A valve needle 7 is slidably provided in the first channel 51 and the first hot runner 61 for closing the nozzle 63.

[0050] Specifically, the bottom of the first hot runner 61 is a gradually shrinking conical mouth, the bottom cross-section of the second hot runner 62 is arranged in a conical shape and is arranged around the first hot runner 61. The first hot runner 61 and the second hot runner 62 are separated by a baffle and merge at the nozzle 63 at the same time. The outlet of the first hot runner 61 is vertically downward, and the outlet of the second hot runner 62 is inclined from top to bottom toward the central axis of the first hot runner 61 and intersects with the nozzle 63; through the above-mentioned baffle and the inclined setting of the outlet of the second hot runner 62, a check structure is added to the nozzle 63 to prevent the two streams of plastic from being serially injected, thereby avoiding mixing in the double-nozzle hot runner system.

[0051] In one embodiment of the present application, an electric telescopic cylinder 71 is provided on the top of the diverter plate 5. The electric telescopic cylinder 71 is located in the template and is fixed to the template. The telescopic end of the electric telescopic cylinder 71 is connected to the valve needle 7. By starting the electric telescopic cylinder 71, the valve needle 7 can slide up and down in the first hot runner 61 to close or open the nozzle 63.

[0052] In one embodiment of the present application, a heater 64 is provided on the outside of the hot nozzle 6 for heating the plastic in the first hot runner 61 and the second hot runner 62 in the hot nozzle 6; further, a heat insulating cap 65 is provided at the nozzle 63 of the hot nozzle 6 to prevent the temperature at the nozzle 63 from being too high and causing damage to the parts that need to be docked.

[0053] Those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the embodiments disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered as exemplary only; the true scope and spirit of the invention are indicated by the claims.

Claims

1. A non-return injection nozzle, characterized in that: include: The injection nozzle body has an injection channel disposed therein, and a step slot hole is disposed at the top of the injection channel; An injection nozzle head is arranged on the top of the injection nozzle body; a feed hole is arranged inside the injection nozzle head, and the feed hole matches the step groove hole; A check core is slidably disposed in the step groove hole to close or open the feed hole; a first channel is disposed on the outer surface of the check core to connect the feed hole with the injection channel.

2. The anti-return injection nozzle according to claim 1, characterized in that: A first step groove is provided at the bottom of the anti-return core, and the first step groove cooperates with the bottom wall of the step groove hole to limit the sliding of the anti-return core.

3. The anti-return injection nozzle according to claim 1, characterized in that: The top of the feed hole is a straight hole, the bottom of the feed hole is a conical hole, the top of the check core is conical, and the top of the check core matches the bottom of the feed hole so that the check core closes the feed hole.

4. The anti-return injection nozzle according to claim 3, characterized in that: The top wall of the anti-return core is an arcuate surface, and a fitting surface is arranged on the conical surface at the top of the anti-return core. The fitting surface is connected to the arcuate surface, and the fitting surface matches the side wall of the conical hole at the bottom of the feed hole.

5. The anti-return injection nozzle according to claim 4, characterized in that: The cross-sectional diameter of the connection between the fitting surface and the arc-shaped surface is larger than the diameter of the straight hole.

6. The anti-return injection nozzle according to claim 1, characterized in that: The first channel is vertically arranged on the outer surface of the anti-return core, and the first channel is in an arc shape.

7. The anti-return injection nozzle according to claim 1, characterized in that: The outer surface of the anti-return core is radially arranged with three first channels.

8. A hot runner system, comprising two non-return injection nozzles according to any one of claims 1 to 7, characterized in that: Also includes: A splitter plate is arranged at the bottom of the two injection nozzle bodies; a first channel and a second channel are arranged inside the splitter plate, and the first channel and the second channel are respectively connected to the injection channels of the two injection nozzle bodies; A hot nozzle is arranged at the bottom of the manifold; a first hot runner and a second hot runner are arranged inside the hot nozzle, the first hot runner is connected to the first channel, the second hot runner is connected to the second channel, the second hot runner is arranged around the first channel, and the bottom of the second hot runner is inclined toward the direction of the first hot runner; A nozzle is arranged at the bottom of the hot nozzle; the bottoms of the first hot runner and the second hot runner are both connected to the nozzle; A valve needle is slidably disposed in the first channel and the first hot runner to close the nozzle.

9. The hot runner system according to claim 8, characterized in that: An electric telescopic cylinder is arranged on the top of the diverter plate, and the extended end of the electric telescopic cylinder is connected to the valve needle.

10. The hot runner system according to claim 8, characterized in that: A heater is arranged outside the hot nozzle, and a heat insulation cap is arranged at the nozzle of the hot nozzle.

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